Lamp



FIG. 1 is a front perspective view of a lamp in accordance with my new design;

FIG. 2 is a front elevational view thereof; the left side elevational and right side elevational views being identical;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The broken lines shown are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a lamp, as shown and described. 